package com.cy.java.basic;

public class HelloWorld {
    public static void main(String[] args)
    {
        String a = "我是你爹";
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("1");
        stringBuilder.append(1);
        String string =stringBuilder.toString();
        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.append(1);
        stringBuffer.append("213");
        String string1 =stringBuffer.toString();
        System.out.println(string1);
        System.out.println(string);
        System.out.println("1");
        System.out.println("2");
        System.out.println("hello world");

        int [] ints ={1,2,3,4,5};
        System.out.println(ints.length);
        System.out.println(ints[1]);

    }
}
